Note: The plug end measures 3-3/4" ODSioux Chief 882 series Test Titan mechanical test plug shall be used for open end closure of installed piping, sealing cleanout threads or to secure piping from contaminants during normal construction process.Proven performance, improved designFor use in both pipe end and cleanout threads “ size specificHollow, male hose thread stem allows for fill/drain through the plugNon-slip shoulder prevents spinning100% non-corrosive, strong and durableSpecifications: Size: 3-1/2"